diff -up chromium-52.0.2743.116/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp.madv_free chromium-52.0.2743.116/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp
--- chromium-52.0.2743.116/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp.madv_free	2016-08-15 13:07:29.279655676 -0400
+++ chromium-52.0.2743.116/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp	2016-08-15 13:08:38.447317416 -0400
@@ -41,6 +41,11 @@
 #include <errno.h>
 #include <sys/mman.h>
 
+#if OS(LINUX) && defined(MADV_FREE)
+// Added in Linux 4.5, but it breaks the sandbox.
+#undef MADV_FREE
+#endif
+
 #ifndef MADV_FREE
 #define MADV_FREE MADV_DONTNEED
 #endif